Roads in France are good.
The main motorway is the A13 to Caen from Paris (225km / 139 miles). It then continues to Cherbourg (although it is not always a motorway). Some of it is toll, but quite cheap. The A84 goes from Caen to Rennes. You can also take the RN13 from Paris, which is free.
To cross the Seine, you can use the Pont de Normandie between Le Havre and Honfleur. Toll is 5€ for a car. A popular site in itself, the bridge, which opened in 1995, at the time was the longest cable-stayed bridge in the world, and had the record for the longest distance between piers; these records were lost in 1999 and 2004 respectively.
There is a free bridge further south at Tancarville, and more bridges as you go further south (where the Seine isn't as wide).
The Most Frequently Asked Travel Questions about Lower Normandy
Where To Stay & Best Hotels in Lower Normandy - updated Apr 2024
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Lower Normandy Travel Guide from Wikitravel. Many thanks to all Wikitravel contributors. Text is available under Creative Commons Attribution-ShareAlike 3.0, images are available under various licenses, see each image for details.